public void test_HalfwidthFullwidth() {
        ICUNormalizer normalizer = new ICUNormalizer("Halfwidth-Fullwidth");
        assertEquals("ケンサク", normalizer.normalize("ｹﾝｻｸ", null));
    }

    public void test_nullInput() {
        ICUNormalizer normalizer = new ICUNormalizer("Any-Lower");
        assertNull(normalizer.normalize(null, null));
    }

    public void test_nullTransliteratorId() {
        try {

        assertEquals('ｱ', HankakuKanaToZenkakuKana.mergeChar('ｱ', 'ﾟ'));
        assertEquals('ｶ', HankakuKanaToZenkakuKana.mergeChar('ｶ', 'a'));
    }

    @Test
    public void test_nullInput() throws Exception {
        HankakuKanaToZenkakuKana normalizer = new HankakuKanaToZenkakuKana();

        String result = normalizer.normalize(null, "field");

        assertEquals(null, result);
    }

        String result = chain.normalize("  TEST CASE  ", "field");

        assertEquals("test_case", result);
    }

    @Test
    public void test_nullInput() throws Exception {
        NormalizerChain chain = new NormalizerChain();
        chain.add(new FullWidthToHalfWidthAlphabetNormalizer());

        String result = chain.normalize(null, "field");